EP0890765B1 - Hydraulic control device for automatic transmission - Google Patents
Hydraulic control device for automatic transmission Download PDFInfo
- Publication number
- EP0890765B1 EP0890765B1 EP98112665A EP98112665A EP0890765B1 EP 0890765 B1 EP0890765 B1 EP 0890765B1 EP 98112665 A EP98112665 A EP 98112665A EP 98112665 A EP98112665 A EP 98112665A EP 0890765 B1 EP0890765 B1 EP 0890765B1
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- European Patent Office
- Prior art keywords
- pressure
- torque converter
- port
- passage
- valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/14—Control of torque converter lock-up clutches
- F16H61/143—Control of torque converter lock-up clutches using electric control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0251—Elements specially adapted for electric control units, e.g. valves for converting electrical signals to fluid signals
- F16H2061/0253—Details of electro hydraulic valves, e.g. lands, ports, spools or springs
Definitions
- This invention relates to a hydraulic control device for an automatic transmission for an automotive vehicle which incorporates a lock up clutch.
- a kind of automatic speed change mechanism for an automotive vehicle comprising a system which combines a torque converter equipped with a lock up clutch and an automatic transmission equipped with a forward/reverse change-over mechanism has, for example, been disclosed in Tokkai Hei 4-78369 published by the Japanese Patent Office in 1992.
- control of the speed changing of the automatic transmission, engagement and disengagement of the lock up clutch, and lubrication of the automatic transmission are performed by the use of pressurized hydraulic fluid from a single hydraulic pump.
- Hydraulic fluid which lubricates hydraulic transmission is supplied via a lubrication passage from a torque converter pressure passage which operates the lock up clutch.
- this hydraulic pump may be constructed as a vane pump, the output pressure of such a pump is reduced when the temperature of the hydraulic fluid is high so that its viscosity is low, and also at times of low vehicle speed.
- an orifice is provided between the torque converter pressure passage and the lubrication passage.
- the output pressure of the hydraulic pump may be sufficiently high, the pressure in the torque converter pressure passage is controlled to a set pressure by a relief valve.
- a relief valve As a result, even when the automatic transmission is being subjected to high load, it is difficult to make considerable increases to the flow of hydraulic fluid supplied from the torque converter pressure passage via the orifice to the lubrication passage.
- US-A-5 090 527 discloses a generic pressure control system for a lock-up clutch including converter pressure paths, which are connected to a lock-up control valve. Further, the system comprises lubrication by-pass circuits, which are connected via orifices to the converter pressure paths. The pressure in the converter pressure paths is regulated by a release valve and connected to the lubrication by-pass circuits by switching valves.
- US-A-4 051 932 discloses a fluid pressure control system for a hydraulic transmission with a lock-up clutch comprising a line pressure regulating valve, converter pressure lines and a lubrication passage. The pressure is regulated by a converter pressure regulating valve.
- this invention provides a hydraulic control device for use with an automatic transmission which is connected to a torque converter comprising a lock up clutch.
- the device comprises a pressure control valve which controls hydraulic pressure supplied to the automatic transmission, a torque converter pressure passage which supplies hydraulic fluid for operating the lock up clutch from the pressure control valve to the lock up clutch, a lubrication passage which supplies hydraulic fluid for lubrication to the automatic transmission, an orifice which joins the torque converter pressure passage to the lubrication passage, and a regulator valve which limits the pressure in the torque converter pressure passage to a predetermined upper limit value.
- the device further comprises a bypass valve detouring the orifice for supplying hydraulic fluid from the torque converter pressure passage to the lubrication passage when the pressure in the torque converter pressure passage rises above a predetermined value.
- the bypass valve comprises the regulator valve and the regulator valve comprises a torque converter pressure port which communicates with the torque converter pressure passage, a drain port which vents the pressure in the torque converter pressure passage, a lubrication port which communicates with the lubrication passage, and a member which connects the torque converter pressure port to the drain port and the lubrication port when the pressure in the torque converter pressure passage rises above a predetermined value.
- the device further comprises a solenoid valve which generates a first signal pressure, a solenoid valve which generates a second signal pressure, and a pressure modifier valve which regulates the second signal pressure according to the first signal pressure to produce a third signal pressure
- the pressure control valve comprises a member which controls the pressure supplied to the automatic transmission in accordance with the first signal pressure
- the regulator valve comprises a port which varies the predetermined value according to the third signal pressure.
- the device further comprises a solenoid valve which generates a first signal pressure
- the pressure control valve comprises a member which controls the pressure which is supplied to the automatic transmission in accordance with the first signal pressure
- the bypass valve comprises a lock up regulator valve which comprises a member which fixes the predetermined pressure according to the first signal pressure
- the lock up clutch comprises a first hydraulic fluid chamber which locks up the torque converter and a second hydraulic fluid chamber which unlocks the torque converter, and that the device further comprises a lock up control valve which selectively connects the torque converter pressure passage to either the first hydraulic fluid chamber or the second hydraulic fluid chamber.
- the device further comprises a solenoid valve which generates a first signal pressure
- the bypass valve comprises the aforesaid regulator valve which has a torque converter pressure port which is communicated to the torque converter pressure passage, a drain port which vents the pressure in the torque converter pressure passage, a lubrication port which communicates with the lubrication passage, a signal pressure port to which the first signal pressure is fed, a member which connects the torque converter pressure port to the drain port and the lubrication port when the pressure in the torque converter pressure passage rises above the predetermined value, and a member which adjusts the predetermined value according to the pressure at the signal pressure port.
- the regulator valve further comprises another torque converter pressure port which communicates with the torque converter pressure port
- the connecting member comprises a first spool
- the predetermined pressure adjustment member comprises a second spool which is arranged in series with the first spool with a spring between them
- the signal pressure port exerts the first signal pressure upon one end of the second spool
- the other torque converter pressure port exerts the pressure in the torque converter pressure passage upon one end of the first spool in a direction opposite to the first signal pressure.
- the regulator valve further comprises a stopper which prevents displacement of the second spool due to the pressure at the signal pressure port past a predetermined position.
- an automatic transmission system for an automotive vehicle to which this invention is applied comprises a torque converter 12 which is equipped with a lock up clutch 12D, and an automatic transmission 11 which is equipped with a forward/reverse change-over mechanism 13.
- the rotation of an engine not shown in the figures is input to a power input shaft 23 of the torque converter 12, and a power output shaft 24 of the automatic transmission 11 rotates drive wheels of the vehicle via a propeller shaft 25.
- the automatic transmission 11 is a toroidal continuously variable transmission comprising a first toroidal speed change section 16 and a second toroidal speed change section 17.
- first section 16 a power input disk 19 and a power output disk 21 between which power rollers 18A and 18B are squeezed.
- the second toroidal speed change section 17 comprises power input disk 20 and a power output disk 22 between which power rollers 18C and 18D are squeezed. Due to the inclination of the power rollers 18A through 18D being varied by hydraulic fluid pressure this transmission 11 can provide any desired speed change ratio.
- This type of toroidal continuously variable transmission is known from U.S. Patent No. 5,542,890 , for example.
- This automatic transmission system is controlled by a hydraulic control device shown in Fig. 2 .
- hydraulic fluid which is pressurized by a hydraulic pump 1 which is driven by the engine is supplied to a line pressure passage 30, and is regulated to a predetermined line pressure PL by a pressure control valve 2 provided in the line pressure passage 30.
- the speed change ratio of the automatic transmission 11 is controlled using this line pressure PL .
- the line pressure PL is controlled by a relief valve 42 so as not to exceed a predetermined upper limit.
- the pressure control valve 2 comprises a port 2A to which is supplied a signal pressure PLSOL from a line pressure solenoid valve 40 which is duty ratio controlled by an electronic controller not shown in the figures, and a spool 2E which is driven responsive to the signal pressure PLSOL led to the port 2A.
- This signal pressure PLSOL corresponds to the first signal pressure of the claims.
- This pressure control valve 2 communicates a port 2C which leads to the line pressure passage 30 either to a port 2B or to a drain port 2D, according to the displacement of the spool 2E.
- the port 2B is connected to a torque converter pressure passage 31 which operates the lock up clutch 12D of the torque converter 12.
- the drain port 2D is connected via a strainer to an intake port 1A of the hydraulic pump 1, and recirculates the hydraulic fluid in the line pressure passage 30 to the intake side of the hydraulic pump 1.
- the pressure control valve 2 regulates both the line pressure PL and also the pressure PT / C in the torque converter pressure passage 31 in response to the signal pressure PLSOL .
- a lock up control valve 5 In the torque converter pressure passage 31 there are provided a lock up control valve 5, a T/C regulator valve 3, a lock up regulator valve 4, and an orifice 8.
- the lock up control valve 5 comprises a spool 5E which is driven in response to a signal pressure PL / USOL from a lock up solenoid valve 41 which is duty controlled by the electronic controller.
- the pressure PT / C is selectively supplied either via a port 5G to a first hydraulic fluid chamber 12E of the lock up clutch 12D, or via a port 5H to a second hydraulic fluid chamber 12F of the lock up clutch 12D.
- This signal pressure PL / USOL corresponds to the second signal pressure of the claims.
- the lock up control valve 5 further comprises a port 5C which is connected to a lubrication passage 37, and in response to the displacement of the spool 5E, this port 5C is connected to a port 5F which leads to an oil cooler 32 and a main lubrication passage 33.
- the main lubrication passage 33 supplies hydraulic fluid to such areas as the rotational shafts of the first and second toroidal speed change sections 16 and 17 of the automatic transmission 11 for the purpose of lubrication.
- the lubrication passage 37 is further connected to a front section lubrication passage 34 via an orifice 7 and a check valve 70.
- the front section lubrication passage 34 is a passage which supplies hydraulic fluid to the forward/reverse change-over mechanism 13 of the automatic transmission 11 for the purpose of lubrication.
- the T/C regulator valve 3 is a valve which controls the pressure PT / C to be within an upper limit pressure withstand value PT / Cmax for the torque converter 12, and comprises a torque converter pressure port 3C which is connected to the torque converter pressure passage 31, a lubrication port 3B, and a drain port 3D.
- the lubrication port 3B is connected to a lubrication passage 37, while the drain port 3D is connected via a strainer to the intake port 1A of the hydraulic pump 1.
- This T/C regulator valve 3 selectively connects the torque converter pressure port 3C to the lubrication port 3B or to the drain port 3D according to the displacement of a spool 3E which is driven responsive to the balance between the pressure PT / C and the pressure of a spring which is opposed thereto.
- the lock up regulator valve 4 is a valve for ensuring the supply pressure to the first hydraulic fluid chamber 12E of the torque converter 12 in precedence to the supply of hydraulic fluid to the main lubrication passage 33 and front section lubrication passage 34.
- This lock up regulator valve 4 comprises a port 4B which is connected to the lubrication passage 37, a port 4C which is connected to the torque converter pressure passage 31, and a port 4D to which the signal pressure PLSOL is fed, and it connects the ports 4B and 4C together according to the displacement of the spool 4E.
- the torque converter pressure PT / C acts upon one end of the spool 4E, and the signal pressure PLSOL acts on the other end of the spool 4E via the port 4D. Further, a spring assists the signal pressure PLSOL .
- the spool 4E either connects or disconnects the torque converter pressure passage 31 and the lubrication passage 37, and so obtains the pressure necessary for the engagement of the lock up clutch 12D, by giving priority to the torque converter pressure PT / C in the torque converter pressure passage 31 over the supply of hydraulic fluid to the lubrication passage 37.
- a relief valve 36 is provided in the torque converter pressure passage 31. This relief valve 36 prevents excessive pressure from being supplied to the first hydraulic fluid chamber 12E and the second hydraulic fluid chamber 12F, if for example the lock up control valve 5 freezes.
- the hydraulic pump 1 which is driven by the engine expels pressurized hydraulic fluid into the line pressure passage 30, and the pressure control valve 2 controls the line pressure PL in this line pressure passage 30 so as to keep it proportional to the signal pressure PLSOL from the line pressure solenoid valve 40, as shown in Fig. 3 .
- the pressure of the pressurized hydraulic fluid which flows into the torque converter pressure passage 31 from the line pressure passage 30 via the port 2B of the pressure control valve 2 is kept lower than the upper limit value PT / Cmax by the T/C regulator valve 3.
- this pressurized hydraulic fluid is supplied to the lubrication passage 37 via the port 4B of the lock up regulator valve 4, the lock up regulator valve 4 performs pressure control to ensure the torque converter pressure PT / C required for the engagement of the lock up clutch 12D rather to supply hydraulic fluid to the lubricating passage 37.
- the lock up regulator valve 4 as shown in Fig. 2 displaces the spool 4E to the right as seen in the figure according to an increase in the signal pressure PLSOL , and cuts off the port 4C until the ratio between the torque converter pressure PT / C and the signal pressure PLSOL exceeds a predetermined value.
- a torque converter pressure PT / C which is sufficient for engagement of the lock up clutch 12D. It should be noted that even in this case a small quantity of hydraulic fluid is supplied to the lubrication passage 37 from the torque converter pressure passage 31 via the orifice 8.
- the port 4C opens according to the balance between the signal pressure PLSOL and the torque converter pressure PT / C .
- the lower limit value for the torque converter pressure PT / C is accordingly raised along with the signal pressure PLSOL , as shown in Fig. 3 .
- the torque converter pressure PT / C maintains a relationship between the line pressure PL and the lower limit value as shown by the sloping line in the figure.
- the torque converter pressure PT / C is maintained at the set pressure PT / Cmax of the T/C regulator valve 3.
- the lock up regulator valve 4 supplies hydraulic fluid from its port 4C to its port 4B, and supplies hydraulic fluid to the lubrication passage 37, so that the lubrication of the automatic transmission 11 does not fail.
- Figs. 4 and 5 show a second embodiment of this invention.
- a pressure modifier valve 9 is provided instead of the lock up regulator valve 4 of the first embodiment described above.
- This pressure modifier valve 9 comprises ports 9B, 9C, and 9D, and the ports 9B and 9C are communicated together by the displacement of a spool 9E.
- the port 9D is formed so as to face one end of the spool 9E, and the signal pressure PLSOL is fed to this port 9D from the line pressure solenoid valve 40.
- the pressure modifier valve 9 further comprises a spring which biases the spool 9E in the same direction.
- the signal pressure PL / USOL is fed to the port 9B from the lock up solenoid valve 41 as a constant pressure Pp , so as to oppose the signal pressure PLSOL .
- the spool 9E is displaced in response to the signal pressure PLSOL, and the pressure level of the hydraulic fluid at the port 9B is modified according the position to which said spool 9E is displaced, and is supplied to the port 9C as a pressure modifier pressure PMF .
- This pressure modifier pressure PMF corresponds to the third signal pressure of the claims.
- the port 9c is connected via a hydraulic fluid passage 35 to a port 3F which faces the base end of the spool 3E of the T/C regulator valve 3.
- the pressure modifier pressure PMF and the pressure of the spring are applied at one end of the spool 3E of the T/C regulator valve 3.
- the torque converter pressure PT / C acts upon the other end of the spool 3E so as to oppose these pressures, in the same way as in the first embodiment described above.
- the spool 3E connects the torque converter pressure port 3C, to which is fed the pressure in the torque converter pressure passage 31, either to the lubrication port 3B which is connected to the lubrication passage 37, or to the drain port 3D which is connected to the intake port 1A of the hydraulic pump 1.
- the T/C regulator valve 3 performs control so as to keep the torque converter pressure PT / C within a range in which it does not exceed its upper limit value PT / Cmax, and moreover so as to keep it at the pressure which is required for engagement of the lock up clutch 12D.
- the pressure modifier valve 9 increases the pressure modifier pressure PMF in accordance with increase of the signal pressure PLSOL until the signal pressure PLSOL reaches a predetermined value P1 , as shown in Fig. 5 . Further, the T/C regulator valve 3 increases the torque converter pressure PT / C in the torque converter pressure passage 31 in accordance with increase of the pressure modifier pressure PMF from the T/C regulator valve 3.
- the pressure modifier pressure PMF becomes equal to the constant pressure Pp which is applied to the port 9B. At this time, the pressure modifier pressure PMF is set so that the torque converter pressure PT / C comes to be equal to its upper limit value PT / Cmax .
- Figs. 6 through 8 show a third embodiment of this invention.
- This embodiment is one in which the T/C regulator valve 3 of the first embodiment and the lock up regulator valve 4 are combined into a single T/C regulator valve 103, as shown in Fig. 6 .
- This T/C regulator valve 103 comprises two spools 104 and 105 arranged in series with a spring 106 between them, as shown in Fig. 7 .
- This T/C regulator valve 103 further comprises a torque converter pressure port 103C which is connected to the torque converter pressure passage 31, another torque converter pressure port 103A which allows the torque converter pressure PT / C to act upon the spool 104 in its axial direction, a lubrication port 103B which is connected to the lubrication passage 37, and a drain port 103D which is connected to the intake port 1A of the hydraulic pump 1.
- the spool 105 is arranged to be coaxial with the spool 104.
- the T/C regulator valve 103 comprises a signal pressure port 103E through which the signal pressure PLSOL acts upon the spool 105 in its axial direction.
- the spool 105 is pressed towards and against the spool 104 in response to increase of this signal pressure PLSOL .
- a sleeve 107 which houses the spool 105 there is formed a claw shaped stopper 109 which prevents further displacement of the spool 105 towards the side of the spool 104 when it exceeds a predetermined value.
- T/C regulator valve 103 The characteristic of this T/C regulator valve 103 is shown in Fig. 8 .
- the torque converter pressure PT / C Since the line pressure is low in the region where the signal pressure PLSOL is low, the torque converter pressure PT / C is also low. In this case, the spool 105 biases the spool 104 in the rightward direction in Figs. 6 and 7 via the spring 106 with increases in the signal pressure PLSOL . As a result of this pressure the spool 104 is kept in its position in which its ports 103B and 103D are cut off from one another, as shown in the figures. Due to this, dropping of the torque converter pressure PT / C is prevented, and sufficient hydraulic fluid pressure for locking up thereof is assured.
- a torque converter pressure PT / C which is required for locking up is ensured when the line pressure PL is low while, in the high load condition when the line pressure PL becomes high, the supply of hydraulic fluid for lubrication to the main lubrication passage 33 and the front section lubrication passage 34 is increased. Moreover, this has a desirable benefit for the durability of the torque converter 12, since the torque converter pressure PT / C is controlled so as to be kept below its predetermined upper limit value PT / Cmax .
- the limit value PT / Cmax is controlled and also a required torque converter pressure PT / C for lock up is ensured, the number of valves in the hydraulic control device is reduced, which makes it possible to reduce the size and weight of the hydraulic control device.
- the T/C regulator valve 3, the lock up regulator valve 4, and the T/C regulator valve 103 together constitute a bypass valve.
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Description
- This invention relates to a hydraulic control device for an automatic transmission for an automotive vehicle which incorporates a lock up clutch.
- A kind of automatic speed change mechanism for an automotive vehicle comprising a system which combines a torque converter equipped with a lock up clutch and an automatic transmission equipped with a forward/reverse change-over mechanism has, for example, been disclosed in Tokkai
Hei 4-78369 - In this speed change system, control of the speed changing of the automatic transmission, engagement and disengagement of the lock up clutch, and lubrication of the automatic transmission are performed by the use of pressurized hydraulic fluid from a single hydraulic pump. Hydraulic fluid which lubricates hydraulic transmission is supplied via a lubrication passage from a torque converter pressure passage which operates the lock up clutch.
- Although this hydraulic pump may be constructed as a vane pump, the output pressure of such a pump is reduced when the temperature of the hydraulic fluid is high so that its viscosity is low, and also at times of low vehicle speed. In this connection, in order to ensure an adequate pressure for the engagement of the lock up clutch, an orifice is provided between the torque converter pressure passage and the lubrication passage.
- On the other hand, when the automatic transmission is subject to high load, i.e. when the torque which is being transmitted by the automatic transmission is high, it is necessary to increase the amount of the lubrication hydraulic fluid for the automatic transmission.
- In this case, although the output pressure of the hydraulic pump may be sufficiently high, the pressure in the torque converter pressure passage is controlled to a set pressure by a relief valve. As a result, even when the automatic transmission is being subjected to high load, it is difficult to make considerable increases to the flow of hydraulic fluid supplied from the torque converter pressure passage via the orifice to the lubrication passage.
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US-A-5 090 527 discloses a generic pressure control system for a lock-up clutch including converter pressure paths, which are connected to a lock-up control valve. Further, the system comprises lubrication by-pass circuits, which are connected via orifices to the converter pressure paths. The pressure in the converter pressure paths is regulated by a release valve and connected to the lubrication by-pass circuits by switching valves. -
US-A-4 051 932 discloses a fluid pressure control system for a hydraulic transmission with a lock-up clutch comprising a line pressure regulating valve, converter pressure lines and a lubrication passage. The pressure is regulated by a converter pressure regulating valve. - It is therefore an object of this invention both to ensure an adequate pressure in the torque converter pressure passage when the output pressure of the hydraulic pump is low, and also to ensure an adequate amount of lubrication at times of high load.
- The object is solved by the features of the independent claim. The sub-claims contain further preferred developments of the invention.
- In order to achieve the above object, this invention provides a hydraulic control device for use with an automatic transmission which is connected to a torque converter comprising a lock up clutch. The device comprises a pressure control valve which controls hydraulic pressure supplied to the automatic transmission, a torque converter pressure passage which supplies hydraulic fluid for operating the lock up clutch from the pressure control valve to the lock up clutch, a lubrication passage which supplies hydraulic fluid for lubrication to the automatic transmission, an orifice which joins the torque converter pressure passage to the lubrication passage, and a regulator valve which limits the pressure in the torque converter pressure passage to a predetermined upper limit value. The device further comprises a bypass valve detouring the orifice for supplying hydraulic fluid from the torque converter pressure passage to the lubrication passage when the pressure in the torque converter pressure passage rises above a predetermined value.
- It is preferable that the bypass valve comprises the regulator valve and the regulator valve comprises a torque converter pressure port which communicates with the torque converter pressure passage, a drain port which vents the pressure in the torque converter pressure passage, a lubrication port which communicates with the lubrication passage, and a member which connects the torque converter pressure port to the drain port and the lubrication port when the pressure in the torque converter pressure passage rises above a predetermined value.
- In this case, it is further preferable that the device further comprises a solenoid valve which generates a first signal pressure, a solenoid valve which generates a second signal pressure, and a pressure modifier valve which regulates the second signal pressure according to the first signal pressure to produce a third signal pressure, the pressure control valve comprises a member which controls the pressure supplied to the automatic transmission in accordance with the first signal pressure, and the regulator valve comprises a port which varies the predetermined value according to the third signal pressure.
- It is also preferable that the device further comprises a solenoid valve which generates a first signal pressure, and that the pressure control valve comprises a member which controls the pressure which is supplied to the automatic transmission in accordance with the first signal pressure, and the bypass valve comprises a lock up regulator valve which comprises a member which fixes the predetermined pressure according to the first signal pressure.
- It is also preferable that the lock up clutch comprises a first hydraulic fluid chamber which locks up the torque converter and a second hydraulic fluid chamber which unlocks the torque converter, and that the device further comprises a lock up control valve which selectively connects the torque converter pressure passage to either the first hydraulic fluid chamber or the second hydraulic fluid chamber.
- It is also preferable that the device further comprises a solenoid valve which generates a first signal pressure, the bypass valve comprises the aforesaid regulator valve which has a torque converter pressure port which is communicated to the torque converter pressure passage, a drain port which vents the pressure in the torque converter pressure passage, a lubrication port which communicates with the lubrication passage, a signal pressure port to which the first signal pressure is fed, a member which connects the torque converter pressure port to the drain port and the lubrication port when the pressure in the torque converter pressure passage rises above the predetermined value, and a member which adjusts the predetermined value according to the pressure at the signal pressure port.
- It is further preferable that the regulator valve further comprises another torque converter pressure port which communicates with the torque converter pressure port, the connecting member comprises a first spool, the predetermined pressure adjustment member comprises a second spool which is arranged in series with the first spool with a spring between them, the signal pressure port exerts the first signal pressure upon one end of the second spool, and the other torque converter pressure port exerts the pressure in the torque converter pressure passage upon one end of the first spool in a direction opposite to the first signal pressure.
- It is further preferable that the regulator valve further comprises a stopper which prevents displacement of the second spool due to the pressure at the signal pressure port past a predetermined position.
- The details as well as other features and advantages of this invention are set forth in the remainder of the specification and are shown in the accompanying drawings.
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Fig. 1 is a schematic diagram of an automatic transmission system to which this invention is applied. -
Fig. 2 is a hydraulic conduit diagram of a hydraulic control device for the automatic transmission system, according to this invention. -
Fig. 3 is a graph specifying a relationship between a signal pressure PLSOL, a line pressure PL, and a torque converter pressure PT/C according to this invention. -
Fig. 4 is similar toFig. 2 , but showing a second embodiment of this invention. -
Fig. 5 is similar toFig. 3 , but showing the second embodiment of this invention. -
Fig. 6 is similar toFig. 2 , but showing a third embodiment of this invention. -
Fig. 7 is an enlarged view of a T/C regulator valve shown inFig. 6 . -
Fig. 8 is similar toFig. 4 , but showing the third embodiment of this invention. - Referring to
Fig. 1 of the drawings an automatic transmission system for an automotive vehicle to which this invention is applied comprises atorque converter 12 which is equipped with a lock upclutch 12D, and anautomatic transmission 11 which is equipped with a forward/reverse change-overmechanism 13. The rotation of an engine not shown in the figures is input to apower input shaft 23 of thetorque converter 12, and apower output shaft 24 of theautomatic transmission 11 rotates drive wheels of the vehicle via apropeller shaft 25. - The
automatic transmission 11 is a toroidal continuously variable transmission comprising a first toroidalspeed change section 16 and a second toroidalspeed change section 17. In thefirst section 16, apower input disk 19 and apower output disk 21 between whichpower rollers speed change section 17 comprisespower input disk 20 and apower output disk 22 between whichpower rollers power rollers 18A through 18D being varied by hydraulic fluid pressure thistransmission 11 can provide any desired speed change ratio. This type of toroidal continuously variable transmission is known fromU.S. Patent No. 5,542,890 , for example. - This automatic transmission system is controlled by a hydraulic control device shown in
Fig. 2 . - In this hydraulic control device, hydraulic fluid which is pressurized by a hydraulic pump 1 which is driven by the engine is supplied to a
line pressure passage 30, and is regulated to a predetermined line pressure PL by apressure control valve 2 provided in theline pressure passage 30. The speed change ratio of theautomatic transmission 11 is controlled using this line pressure PL. The line pressure PL is controlled by arelief valve 42 so as not to exceed a predetermined upper limit. - The
pressure control valve 2 comprises a port 2A to which is supplied a signal pressure PLSOL from a linepressure solenoid valve 40 which is duty ratio controlled by an electronic controller not shown in the figures, and aspool 2E which is driven responsive to the signal pressure PLSOL led to the port 2A. This signal pressure PLSOL corresponds to the first signal pressure of the claims. - This
pressure control valve 2 communicates a port 2C which leads to theline pressure passage 30 either to aport 2B or to adrain port 2D, according to the displacement of thespool 2E. - The
port 2B is connected to a torqueconverter pressure passage 31 which operates the lock upclutch 12D of thetorque converter 12. - The
drain port 2D is connected via a strainer to anintake port 1A of the hydraulic pump 1, and recirculates the hydraulic fluid in theline pressure passage 30 to the intake side of the hydraulic pump 1. - Accordingly, the
pressure control valve 2 regulates both the line pressure PL and also the pressure PT/C in the torqueconverter pressure passage 31 in response to the signal pressure PLSOL. - In the torque
converter pressure passage 31 there are provided a lock upcontrol valve 5, a T/C regulator valve 3, a lock upregulator valve 4, and anorifice 8. - The lock up
control valve 5 comprises aspool 5E which is driven in response to a signal pressure PL/USOL from a lock upsolenoid valve 41 which is duty controlled by the electronic controller. In response to the displacement of thisspool 5E, the pressure PT/C is selectively supplied either via a port 5G to a firsthydraulic fluid chamber 12E of the lock upclutch 12D, or via aport 5H to a secondhydraulic fluid chamber 12F of the lock upclutch 12D. This signal pressure PL/USOL corresponds to the second signal pressure of the claims. - The lock up
control valve 5 further comprises aport 5C which is connected to alubrication passage 37, and in response to the displacement of thespool 5E, thisport 5C is connected to aport 5F which leads to anoil cooler 32 and amain lubrication passage 33. - In other words, when the spool is displaced and the port 5G is connected to the
port 5B, i.e. in parallel with the engagement of the lock upclutch 12D, theport 5F is connected to theport 5C, and hydraulic fluid is supplied from thelubrication passage 37 to theoil cooler 32 and themain lubrication passage 33. - The
main lubrication passage 33 supplies hydraulic fluid to such areas as the rotational shafts of the first and second toroidalspeed change sections automatic transmission 11 for the purpose of lubrication. - The
lubrication passage 37 is further connected to a frontsection lubrication passage 34 via anorifice 7 and acheck valve 70. The frontsection lubrication passage 34 is a passage which supplies hydraulic fluid to the forward/reverse change-overmechanism 13 of theautomatic transmission 11 for the purpose of lubrication. - The T/
C regulator valve 3 is a valve which controls the pressure PT/C to be within an upper limit pressure withstand value PT/Cmax for thetorque converter 12, and comprises a torqueconverter pressure port 3C which is connected to the torqueconverter pressure passage 31, alubrication port 3B, and adrain port 3D. Thelubrication port 3B is connected to alubrication passage 37, while thedrain port 3D is connected via a strainer to theintake port 1A of the hydraulic pump 1. - This T/
C regulator valve 3 selectively connects the torqueconverter pressure port 3C to thelubrication port 3B or to thedrain port 3D according to the displacement of aspool 3E which is driven responsive to the balance between the pressure PT/C and the pressure of a spring which is opposed thereto. - The lock up
regulator valve 4 is a valve for ensuring the supply pressure to the firsthydraulic fluid chamber 12E of thetorque converter 12 in precedence to the supply of hydraulic fluid to themain lubrication passage 33 and frontsection lubrication passage 34. - This lock up
regulator valve 4 comprises aport 4B which is connected to thelubrication passage 37, aport 4C which is connected to the torqueconverter pressure passage 31, and aport 4D to which the signal pressure PLSOL is fed, and it connects theports spool 4E. - The torque converter pressure PT/C acts upon one end of the
spool 4E, and the signal pressure PLSOL acts on the other end of thespool 4E via theport 4D. Further, a spring assists the signal pressure PLSOL. - According to this pressure balance, the
spool 4E either connects or disconnects the torqueconverter pressure passage 31 and thelubrication passage 37, and so obtains the pressure necessary for the engagement of the lock up clutch 12D, by giving priority to the torque converter pressure PT/C in the torqueconverter pressure passage 31 over the supply of hydraulic fluid to thelubrication passage 37. - A
relief valve 36 is provided in the torqueconverter pressure passage 31. Thisrelief valve 36 prevents excessive pressure from being supplied to the firsthydraulic fluid chamber 12E and the secondhydraulic fluid chamber 12F, if for example the lock upcontrol valve 5 freezes. - With regard to the above described hydraulic passages, the hydraulic pump 1 which is driven by the engine expels pressurized hydraulic fluid into the
line pressure passage 30, and thepressure control valve 2 controls the line pressure PL in thisline pressure passage 30 so as to keep it proportional to the signal pressure PLSOL from the linepressure solenoid valve 40, as shown inFig. 3 . - The pressure of the pressurized hydraulic fluid which flows into the torque
converter pressure passage 31 from theline pressure passage 30 via theport 2B of thepressure control valve 2 is kept lower than the upper limit value PT/Cmax by the T/C regulator valve 3. Although this pressurized hydraulic fluid is supplied to thelubrication passage 37 via theport 4B of the lock upregulator valve 4, the lock upregulator valve 4 performs pressure control to ensure the torque converter pressure PT/C required for the engagement of the lock up clutch 12D rather to supply hydraulic fluid to thelubricating passage 37. - The lock up
regulator valve 4 as shown inFig. 2 displaces thespool 4E to the right as seen in the figure according to an increase in the signal pressure PLSOL, and cuts off theport 4C until the ratio between the torque converter pressure PT/C and the signal pressure PLSOL exceeds a predetermined value. By doing this, since the supply of hydraulic fluid to thelubrication passage 37 via theport 4B is prevented, it is possible to ensure a torque converter pressure PT/C which is sufficient for engagement of the lock up clutch 12D. It should be noted that even in this case a small quantity of hydraulic fluid is supplied to thelubrication passage 37 from the torqueconverter pressure passage 31 via theorifice 8. - The
port 4C opens according to the balance between the signal pressure PLSOL and the torque converter pressure PT/C. On opening, the lower limit value for the torque converter pressure PT/C is accordingly raised along with the signal pressure PLSOL, as shown inFig. 3 . By this kind of characteristic of the lock upregulator valve 4, the torque converter pressure PT/C maintains a relationship between the line pressure PL and the lower limit value as shown by the sloping line in the figure. - After the lower limiting value reaches a set pressure PT/Cmax of the T/
C regulator valve 3 due to an increase in the signal pressure PLSOL, the torque converter pressure PT/C is maintained at the set pressure PT/Cmax of the T/C regulator valve 3. - Accordingly it is possible to prevent the torque converter pressure PT/C from varying and to ensure a sufficient pressure for locking up the
torque converter 12. - When the temperature of the hydraulic fluid is high and also the vehicle speed is low, the amount of hydraulic fluid used increases, due to low fluid viscosity, in relation to the amount thereof provided by the hydraulic pump 1, and as a result the line pressure PL drops. Even in this kind of situation no problem occurs with regard to engagement of the lock up clutch 12, because the torque converter pressure PT/C is kept above the lower limit value.
- On the other hand, in operational circumstances when the
automatic transmission 11 requires a large quantity of hydraulic fluid for lubrication, as when a high load is imposed upon the automatic transmission or the like, the necessary flow amount of lubrication in themain lubrication passage 33 and the frontsection lubrication passage 34 is easily provided, since hydraulic fluid is supplied to thelubrication passage 37 from the lock upregulator valve 4 as well as the T/C regulator valve 3 and theorifice 8. In this situation, the rise of the line pressure PL is limited to the upper limit value PT/Cmax set by the T/C regulator valve 3. There is no danger that the pressure acting upon thetorque converter 12 may become excessive, since this upper limit value PT/Cmax is set below the upper limit pressure withstand value of thetorque converter 12, and therefore no influence is exerted upon the durability of thetorque converter 12. - Furthermore, in contrast to the fact that the required torque converter pressure for locking up is ensured even when line pressure PL is low, it is possible during high load conditions to increase the amount of hydraulic fluid for lubrication so as not to adversely affect the durability of the
torque converter 12. - Yet further, even in the region in which the line pressure PL is low, if the output of the hydraulic pump 1 has sufficient margin, even in the region in which the torque converter pressure PT/C does not rise to its upper limit value PT/Cmax, the lock up
regulator valve 4 supplies hydraulic fluid from itsport 4C to itsport 4B, and supplies hydraulic fluid to thelubrication passage 37, so that the lubrication of theautomatic transmission 11 does not fail. -
Figs. 4 and5 show a second embodiment of this invention. - In this embodiment, a
pressure modifier valve 9 is provided instead of the lock upregulator valve 4 of the first embodiment described above. - This
pressure modifier valve 9 comprisesports ports port 9D is formed so as to face one end of the spool 9E, and the signal pressure PLSOL is fed to thisport 9D from the linepressure solenoid valve 40. Thepressure modifier valve 9 further comprises a spring which biases the spool 9E in the same direction. - The signal pressure PL/USOL is fed to the
port 9B from the lock upsolenoid valve 41 as a constant pressure Pp, so as to oppose the signal pressure PLSOL. - As a result, the spool 9E is displaced in response to the signal pressure PLSOL, and the pressure level of the hydraulic fluid at the
port 9B is modified according the position to which said spool 9E is displaced, and is supplied to theport 9C as a pressure modifier pressure PMF. This pressure modifier pressure PMF corresponds to the third signal pressure of the claims. - The port 9c is connected via a
hydraulic fluid passage 35 to aport 3F which faces the base end of thespool 3E of the T/C regulator valve 3. - By doing this, the pressure modifier pressure PMF and the pressure of the spring are applied at one end of the
spool 3E of the T/C regulator valve 3. The torque converter pressure PT/C acts upon the other end of thespool 3E so as to oppose these pressures, in the same way as in the first embodiment described above. - The
spool 3E, according to the balance of these pressures, connects the torqueconverter pressure port 3C, to which is fed the pressure in the torqueconverter pressure passage 31, either to thelubrication port 3B which is connected to thelubrication passage 37, or to thedrain port 3D which is connected to theintake port 1A of the hydraulic pump 1. By doing this, the T/C regulator valve 3 performs control so as to keep the torque converter pressure PT/C within a range in which it does not exceed its upper limit value PT/Cmax, and moreover so as to keep it at the pressure which is required for engagement of the lock up clutch 12D. - The
pressure modifier valve 9 increases the pressure modifier pressure PMF in accordance with increase of the signal pressure PLSOL until the signal pressure PLSOL reaches a predetermined value P1, as shown inFig. 5 . Further, the T/C regulator valve 3 increases the torque converter pressure PT/C in the torqueconverter pressure passage 31 in accordance with increase of the pressure modifier pressure PMF from the T/C regulator valve 3. - If the signal pressure PLSOL exceeds its predetermined value P1, then the pressure modifier pressure PMF becomes equal to the constant pressure Pp which is applied to the
port 9B. At this time, the pressure modifier pressure PMF is set so that the torque converter pressure PT/C comes to be equal to its upper limit value PT/Cmax. - In this embodiment as well, in the same way as with the first embodiment described above, if the line pressure is low, on the one hand the torque converter pressure PT/C which is necessary for locking up is ensured while during high load the amount of hydraulic fluid for lubrication is increased, and thereby it is possible to ensure that the durability of the
torque converter 12 does not suffer. - Further, according to this second embodiment, it is possible easily to adapt the construction to different torque converters whose pressure withstand values are different, just by varying the constant pressure Pp which is applied to the
pressure modifier valve 9. -
Figs. 6 through 8 show a third embodiment of this invention. - This embodiment is one in which the T/
C regulator valve 3 of the first embodiment and the lock upregulator valve 4 are combined into a single T/C regulator valve 103, as shown inFig. 6 . This T/C regulator valve 103 comprises twospools spring 106 between them, as shown inFig. 7 . - This T/
C regulator valve 103 further comprises a torqueconverter pressure port 103C which is connected to the torqueconverter pressure passage 31, another torqueconverter pressure port 103A which allows the torque converter pressure PT/C to act upon thespool 104 in its axial direction, alubrication port 103B which is connected to thelubrication passage 37, and adrain port 103D which is connected to theintake port 1A of the hydraulic pump 1. - When the
spool 104 is displaced leftwards inFig. 7 , then the torqueconverter pressure ports converter pressure passage 31 is connected to thelubrication passage 37. When thespool 104 is displaced yet further leftwards, the torqueconverter pressure port 103C and thedrain port 103D are connected together, and the torqueconverter pressure passage 31 is also connected to theintake port 1A of the hydraulic pump 1 as well. - The
spool 105 is arranged to be coaxial with thespool 104. The T/C regulator valve 103 comprises asignal pressure port 103E through which the signal pressure PLSOL acts upon thespool 105 in its axial direction. - The
spool 105 is pressed towards and against thespool 104 in response to increase of this signal pressure PLSOL. In asleeve 107 which houses thespool 105 there is formed a claw shapedstopper 109 which prevents further displacement of thespool 105 towards the side of thespool 104 when it exceeds a predetermined value. - The characteristic of this T/
C regulator valve 103 is shown inFig. 8 . - Since the line pressure is low in the region where the signal pressure PLSOL is low, the torque converter pressure PT/C is also low. In this case, the
spool 105 biases thespool 104 in the rightward direction inFigs. 6 and7 via thespring 106 with increases in the signal pressure PLSOL. As a result of this pressure thespool 104 is kept in its position in which itsports - When the signal pressure PLSOL exceeds a predetermined value, further displacement of the
spool 105 is prevented by the stopper of thesleeve 107 On the other hand, since the torque converter pressure PT/C which is supplied to thepressure port 103A of the torque converter continues to increase further, thespool 104 is displaced towards the spool and contacts thereto against the resistance of thespring 106, thus connecting the torqueconverter pressure port 103C to thelubrication port 103B. Further, it is also connected to thedrain port 103D. By doing this, along with supplying the operating hydraulic fluid in the torqueconverter pressure passage 31 to the lubricationhydraulic fluid passage 37, the torque converter pressure PT/C is kept below its upper limit value PT/Cmax. - Accordingly, in the same way as with the first embodiment described above, on the one hand a torque converter pressure PT/C which is required for locking up is ensured when the line pressure PL is low while, in the high load condition when the line pressure PL becomes high, the supply of hydraulic fluid for lubrication to the
main lubrication passage 33 and the frontsection lubrication passage 34 is increased. Moreover, this has a desirable benefit for the durability of thetorque converter 12, since the torque converter pressure PT/C is controlled so as to be kept below its predetermined upper limit value PT/Cmax. - Further, according to this embodiment, since, with the single T/
C regulator valve 103, the limit value PT/Cmax is controlled and also a required torque converter pressure PT/C for lock up is ensured, the number of valves in the hydraulic control device is reduced, which makes it possible to reduce the size and weight of the hydraulic control device. - It should be noted that in the above described third embodiment the T/
C regulator valve 3, the lock upregulator valve 4, and the T/C regulator valve 103 together constitute a bypass valve.
Claims (7)
- A hydraulic control device for use with an automatic transmission (11) which is connected to a torque converter (12) comprising a lock up clutch (12D), said device comprising a pressure control valve (2) which controls hydraulic pressure supplied to said automatic transmission (11), a torque converter pressure passage (31) which supplies hydraulic fluid for operating said lock up clutch (12D) from said pressure control valve (2) to said lock up clutch (12D), a lubrication passage (37) which supplies hydraulic fluid for lubrication to said automatic transmission (11), an orifice (8) which joins said torque converter pressure passage (31) to said lubrication passage (37), a regulator valve (3, 103) which limits the pressure in said torque converter pressure passage (31) to within a predetermined upper limit value, and
a bypass valve (3, 4, 103) detouring said orifice (8) for supplying hydraulic fluid from said torque converter pressure passage (31) to said lubrication passage (37) when the pressure in said torque converter pressure passage (31) rises above a predetermined value,
characterized by
a solenoid valve (40) which generates a first signal pressure, wherein said pressure control valve (2) comprises a member (2E) which controls the pressure which is supplied to said automatic transmission (11) in accordance with said first signal pressure, and said bypass valve (3, 4, 103) comprises a lock up regulator valve (4) which comprises a member (4E) which fixes said predetermined pressure according to said first signal pressure. - A hydraulic control device according to Claim 1, wherein said bypass valve (3, 4, 103) comprises said regulator valve (3), and said regulator valve (3) comprises a torque converter pressure port (3C) which is communicated to said torque converter pressure passage (31), a drain port (3D) which vents the pressure in said torque converter pressure passage (31), a lubrication port (3B) which is communicated to said lubrication passage (37), and a member (3E) which connects said torque converter pressure port (3C) to said drain port (3D) and said lubrication port (3B) when the pressure in said torque converter pressure passage (31) rises above a predetermined value.
- A hydraulic control device according to Claim 1, wherein said lock up clutch (12D) comprises a first hydraulic fluid chamber (12E) which locks up said torque converter (12) and a second hydraulic fluid chamber (12F) which releases the locking up of said torque converter (12), and said hydraulic device further comprises a lock up control valve (5) which selectively connects said torque converter pressure passage (31) to either of said first hydraulic fluid chamber (12E) and said second hydraulic fluid chamber (12F).
- A hydraulic control device according to Claim 2, further comprising a solenoid valve (40) which generates a first signal pressure, a solenoid valve (41) which generates a second signal pressure, and a pressure modifier valve (9) which regulates said second signal pressure according to said first signal pressure to produce a third signal pressure, wherein said pressure control valve (2) comprises a member (2E) which controls the pressure supplied to said automatic transmission (11) in accordance with said first signal pressure, and said regulator valve (3) comprises a port (3F) which varies said predetermined value according to said third signal pressure.
- A hydraulic control device according to Claim 1, further comprising a solenoid valve (40) which generates a first signal pressure, wherein said bypass valve (3, 4, 103) comprises said regulator valve (103), and said regulator valve (103) comprises a torque converter pressure port (103C) which is communicated to said torque converter pressure passage (31), a drain port (103D) which vents the pressure in said torque converter pressure passage (31), a lubrication port (103B) which is communicated to said lubrication passage, a signal pressure port (103E) to which said first signal pressure is fed, a member (104) which connects said torque converter pressure port (3C) to said drain port (3D) and said lubrication port (3E) when the pressure in said torque converter pressure passage (31) rises above said predetermined value, and a member (105) which adjusts said predetermined value according to the pressure at said signal pressure port (103E).
- A hydraulic control device according to Claim 5, wherein said regulator valve (103) further comprises another torque converter pressure port (103A) which is communicated to said torque converter pressure port (103C), said connecting member (104) comprises a first spool (104), said predetermined pressure adjustment member (105) comprises a second spool (105) which is arranged in series with said first spool (104) with a spring (108) between them, said signal pressure port (103E) exerts said first signal pressure upon one end of said second spool (105), and said other torque converter pressure port (103A) exerts the pressure in said torque converter pressure passage (31) upon one end of said first spool (104) in a direction opposite to said first signal pressure.
- A hydraulic control device according to Claim 6, wherein said regulator valve (103) further comprises a stopper (109) which prevents displacement of said second spool (105) due to the pressure at said signal pressure port (103E) past a predetermined position.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18399397A JP3635190B2 (en) | 1997-07-09 | 1997-07-09 | Hydraulic control device for automatic transmission |
JP183993/97 | 1997-07-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0890765A1 EP0890765A1 (en) | 1999-01-13 |
EP0890765B1 true EP0890765B1 (en) | 2008-09-24 |
Family
ID=16145450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98112665A Expired - Lifetime EP0890765B1 (en) | 1997-07-09 | 1998-07-08 | Hydraulic control device for automatic transmission |
Country Status (4)
Country | Link |
---|---|
US (1) | US6056094A (en) |
EP (1) | EP0890765B1 (en) |
JP (1) | JP3635190B2 (en) |
DE (1) | DE69840041D1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3592093B2 (en) * | 1998-08-10 | 2004-11-24 | ジヤトコ株式会社 | Lubrication structure of toroidal type continuously variable automatic transmission |
JP2001330140A (en) * | 2000-05-22 | 2001-11-30 | Toyota Motor Corp | Control device for vehicular clutch |
US20030155182A1 (en) * | 2000-07-07 | 2003-08-21 | Bernhard Sich | Device and method for accurately supplying components of an automatic gearbox for motor vehicles |
JP4178952B2 (en) * | 2002-12-27 | 2008-11-12 | アイシン・エィ・ダブリュ株式会社 | Hydraulic control device for lockup mechanism |
WO2006009080A1 (en) * | 2004-07-16 | 2006-01-26 | Komatsu Ltd. | Lubricating oil supply control device for transmission of vehicle |
US7677373B2 (en) * | 2007-05-31 | 2010-03-16 | Dana Heavy Vehicle Systems Group, Llc | Lock-up clutch control method |
JP4862830B2 (en) * | 2008-01-24 | 2012-01-25 | トヨタ自動車株式会社 | Control device for fluid transmission |
JP5125604B2 (en) * | 2008-02-27 | 2013-01-23 | マツダ株式会社 | Hydraulic control device for automatic transmission |
US8275530B2 (en) * | 2010-09-20 | 2012-09-25 | Sonnax Industries, Inc. | Apparatus and method for increasing transmission line fluid pressure |
JP5692030B2 (en) * | 2011-12-01 | 2015-04-01 | トヨタ自動車株式会社 | Hydraulic control device for vehicle |
US9383003B2 (en) * | 2012-06-18 | 2016-07-05 | Gm Global Technology Operations, Llc | Hydraulic control system for a continuously variable transmission |
JP6007746B2 (en) * | 2012-11-20 | 2016-10-12 | アイシン精機株式会社 | Hydraulic oil supply device |
US9506548B2 (en) | 2014-03-12 | 2016-11-29 | Ford Global Technologies | Control valve and method of controlling torque converter lock-up clutch |
JP6473473B2 (en) * | 2017-03-27 | 2019-02-20 | 本田技研工業株式会社 | Valve structure and hydraulic circuit using the same |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5211365A (en) * | 1975-07-16 | 1977-01-28 | Toyota Motor Corp | Oil pressure control device for fluid transmission mechanism with clut ch connected directly |
DE58907528D1 (en) * | 1988-12-01 | 1994-05-26 | Zahnradfabrik Friedrichshafen | CONTROL DEVICE FOR A FRICTIONAL BRIDGE CLUTCH OF A HYDRODYNAMIC TORQUE CONVERTER. |
DE3937939A1 (en) * | 1988-12-01 | 1990-06-07 | Zahnradfabrik Friedrichshafen | Control unit for friction keyed bridge coupling - has axially located coupling element subjected to pressure at its end faces from operating chambers across regulating valves |
DE3928048A1 (en) * | 1989-08-25 | 1991-02-28 | Ford Werke Ag | CONTROL DEVICE FOR A BRIDGE CLUTCH OF A HYDROKINETIC TORQUE CONVERTER |
JP2846362B2 (en) * | 1989-09-26 | 1999-01-13 | ジャトコ株式会社 | Hydraulic control device for lock-up clutch |
US4998604A (en) * | 1990-02-12 | 1991-03-12 | General Motors Corporation | Variable capacity control apparatus for an automotive torque converter clutch |
DE69112109T2 (en) * | 1990-04-18 | 1996-04-18 | Mazda Motor | Control system for a torque converter. |
JP2661339B2 (en) * | 1990-07-19 | 1997-10-08 | 日産自動車株式会社 | Line pressure control device for continuously variable transmission |
JP2653249B2 (en) * | 1990-12-28 | 1997-09-17 | トヨタ自動車株式会社 | Hydraulic control system for vehicle belt-type continuously variable transmission with torque converter with lock-up clutch |
US5163540A (en) * | 1992-02-24 | 1992-11-17 | Saturn Corporation | Control valving for a torque converter and clutch assembly |
US5513732A (en) * | 1994-08-05 | 1996-05-07 | Ford Motor Company | Regulation of hydraulic pressure in a system having multiple pressure sources |
-
1997
- 1997-07-09 JP JP18399397A patent/JP3635190B2/en not_active Expired - Fee Related
-
1998
- 1998-07-08 EP EP98112665A patent/EP0890765B1/en not_active Expired - Lifetime
- 1998-07-08 DE DE69840041T patent/DE69840041D1/en not_active Expired - Fee Related
- 1998-07-08 US US09/111,702 patent/US6056094A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69840041D1 (en) | 2008-11-06 |
EP0890765A1 (en) | 1999-01-13 |
US6056094A (en) | 2000-05-02 |
JP3635190B2 (en) | 2005-04-06 |
JPH1130307A (en) | 1999-02-02 |
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